An automobile battery has an emf of 12.6 v and an internal resistance of 0.0750 ω. the headlights together have an equivalent resistance of 5.10 ω (assumed constant). (a) what is the potential difference across the headlight bulbs when they are the only load on the battery? (enter your answer to at least two decimal places.) v (b) what is the potential difference across the headlight bulbs when the starter motor is operated, with 35.0 a of current in the motor? (enter your answer to at least two decimal places.) v

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

its c i just checked it

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.